Hi, I have the same problem. It's interesting - On Jan 15, I was able to update an app without errors. Now I'm getting the SDK warning and 2 warnings about 32-bit architecture. Xcode 10.1, Mojave 10.14.3, PROJECT & TARGETS: 12.1, Project Format: Xcode 10.0 compatible, Architectures are preset. Is there anything I need to manually or just wait till March?
I'm also getting the same and it is affecting our project delivery.
Has anyone solved this yet?